There are 23 teachers how many students at each school in equivalent ratio

Can someone tell me if this is perpendicular? !

The sum of the squares of two numbers is 8 . the product of the two numbers is 4. find the numbers.

4. bob solved the inequality problem below incorrectly. explain his error and redo the problem showing the correct answer. −2x + 5 < 17 −2x + 5-5 < 17-5 -2x/-2 < 12/-2 x < -6